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VOIP Over EV-DO Rev. A Put To Test

Article Comments  6  

Jun 8, 2006, 1:32 PM   by (staff)

Qualcomm yesterday announced it had successfully tested making calling using Voice over IP (VOIP) on a CDMA EV-DO Revision A network. The tests involved 62 simultaneous calls in a single 1.25 MHz channel using SIP-based voice clients. SIP is a common VOIP protocol used by many internet phones including those running Gizmo Project. Qualcomm and CDMA operators are looking to VOIP because when a channel is used for EV-DO data, it cannot be used for voice calls. Not only would VOIP over Revision A networks allow carriers to use their spectrum more efficiently by not having to separate voice and data, it would increase efficiency by allowing them to carry more voice calls in a data channel than in a traditional voice channel. Qualcomm was able to squeeze up to 30 times more voice calls in a 1.25 MHz channel using VOIP than traditional voice connections in their test.

more info at Qualcomm »




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Jun 11, 2006, 7:23 PM

So The Envisionaries Are Getting Closer!

I remember a few years back in a sales & technology training seminar that in time we will see a shift from counting minutes to counting data or bandwidth consumption instead. In the past few years we have seen the addition of paying for data packages for internet useage over our cell phones, and now we are becoming closer and closer to where this data is not only for what we use for email & web browsing (or video) but for voice as well.

I thought it made sense a few years ago and still do to this day.

Jun 9, 2006, 10:24 AM

Its about simplifying the core network

Carriers in general want to free themselves of their costly, proprietary, and difficult to maintain and upgrade core network. They want an IP core because its cheaper, easy to write apps for and because one core type can support multiple services (like voice, data, wireless, landline voice, and even cable TV.).

VoIP can give very good quality provided voice traffic is prioritized. If you control the network (regardless if its cable, wireless, or copper cable)then you can priortize traffic. Vonage etc. do not control the network so their quality is crap. A lot enterprise class VoIP providers will also send the traffic on a dedicated and leased voice channel once it leaves their last mile infrastructure or via traditional ATM-based fiber...

Jun 8, 2006, 4:06 PM


Strange how someone would think of using VOIP on a cell phone.....

But this does provide a number of potential problems:

1) Call quality. Seriously, I've tried Vonage in different locations with vastly different results. On top of that, using it with various phones yields different results - some phones sound like crap; others are fine. And, cramming 30 people on one channel is bound to have quality issues.

2) Dropped calls / Network problems. How well is this going to be handled? Current phones do a good job combating this, but it hasn't always been this good. It wasn't long ago when dropping calls was common.

It will be interesting though.
I think one idea is using VoIP over a broadband card from your SIP client installed on your PC. Long distance calls over VoIP (Gizmo, Skype, etc.) are inexpensive when compared to calling from your cell phone.
I don't think it is particularly strange to use VoIP on a cell phone. That was actually one of the original intents of higher speeds of data. It would increase efficiency and push down operating costs, and of course cut prices for the consumers. It's ...
Quality should not be an issue. I've talked to the Qualcomm engineers working on this at CTIA and other trade shows, and everything about it will be as good or better than current 1xRTT voice. In fact, latency may actually be slightly better, believe ...
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